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Streamflow Regime in Northern Watersheds: Human vs. Natural Impacts

Analyzing streamflow changes in large northern watersheds from 1930-1995, comparing human impacts and natural variations. Examining monthly discharge, annual precipitation trends, and reservoir effects on streamflow dynamics.

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Streamflow Regime in Northern Watersheds: Human vs. Natural Impacts

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  1. Streamflow Regime and Changes in Large Northern Watersheds: Human Impacts vs. Natural Variations Daqing Yang, Douglas Kane Water and Environment Research Center University of Alaska Fairbanks, AK99775 Baisheng Ye Cold & Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, P. R. China

  2. Reservoir A J I A K H F N E G D B M C L

  3. Monthly flow regime and change Lena river, 1935-94 Yenisei river, 1936-1995 Monthly discharge (m3/s) Ob river, 1930-94

  4. Comparisons of long-term daily mean discharge (m3/s)

  5. Annual discharge and trend for Ob, Yenisei & Lena rivers, 1930-95

  6. Annual precipitation and trend in large Siberian basins, 1935-98

  7. LENA – KUSUR Area ----2,430,000km2 Runoff ---523.9km3 Data ---1939-1994 A H G D B E Aldan tributary Area ----28.6% Runoff ---- 30% Data ---1942-1990 F Vilui reservoir, operated in 1967, max. capacity 35.9km3, 7% Lena River total runoff C Vilui basin Area ---18.6% Runoff ---- 9% Data ---1936-1990 Upper Lena basin Area ----36.9% Runoff --- 42% Data ---1936-1990

  8. Monthly discharge (m3/s) Reservoir Effect on Streamflow

  9. Monthly mean discharge for pre-dam (1942-67) and post-dam (1968-90) periods at the 4 stations Monthly discharge (m3/s)

  10. Dam Impact on Water Temp: Mean stream temperatures, predam (1950-67) vs. postdam (1968-92) periods, Suntar station. June discharge and June 20 stream temperature, Suntar station.

  11. Monthly discharge trends for major sub-basins and at Lena basin outlet

  12. Reconstruction of monthly discharge at basin outlet Regression functions between upstream and downstream Q: June: Qoutlet = 0.315+3.315Q1+0.813Q2 May: Qoutlet = 660.8e0.0002Q2

  13. Reconstructed discharge (m3/s) Observed discharge (m3/s) Comparison between the observed and reconstructed monthly discharge at Lena basin outlet / Kusur station

  14. Comparison between observed and reconstructed monthly discharge at the Lena basin outlet, 1942-90 Monthly discharge (m3/s)

  15. Comparison of observed vs. reconstructed mean flows at Kusur station

  16. Comparisons of annual discharge and its trend, observed vs. reconstructed, Lena basin outlet

  17. Reservoir A J I A K H F N E G D B M C L

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